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                [Algorithmic Engagements 2011]The Shortest Period                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>
<h1 style="font-size: 30px; margin: 0px 0px 20px; color: rgb(51,51,51); line-height: 18px; padding-top: 20px; font-family: 'Trebuchet MS', Verdana, Tahoma, Arial"><span style="font-size: medium">一个单词t被称为s的一个循环节当且仅当它的长度不超过t并且存在一个整数k使得s是t^k的一个前缀。比如entente的循环节是：ent,entent和entente。</span></h1>
</div>
<div>
<p style="font-size: 13px; color: rgb(68,68,68); line-height: 18px; font-family: Tahoma, Arial"><span style="font-size: medium">Fotile在黑板上写下了一个很长的单词。Seter对Fotile的课不感兴趣，但是他把所有恰好在这个单词里删去一个字母的单词都写了下来。现在他想知道这些单词中拥有最短循环节的一个。</span></p>
<p style="font-size: 13px; color: rgb(68,68,68); line-height: 18px; font-family: Tahoma, Arial"><span style="font-size: medium"><br />
</span></p>
</div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">第一行为数据组数d，不超过10。</span></div>
<div><span style="font-size: medium">每个数据包含一个数N及一个长为N的小写字母单词。</span></div>
<div><span style="font-size: medium"><br />
</span></div></p><hr/><h3>输出格式</h3><p><div><span style="font-size: medium">最短循环节长度。</span></div>
<div></div></p><hr/><h3>样例输入</h3><pre>1
8 ababcaba
</pre><hr/><h3>样例输出</h3><pre>2
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Seter提供</p>
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